We had a couple of related but opposite words.

我们学了几个相关但意思相反的单词。

(or opposite) word is also different.

（或相反）字也不同。

An " oxymoron" is a figure of speech that has two contradictory or opposite words appearing side by side.

“oxymoron”是一种修辞手法，有两个矛盾或相反的词并排出现。